Not getting response with http GET call in prortactor

I am calling a GET api in my automation suite but not getting response back. Same API works from postman. I have plenty of console.log which are not getting printed. There are no errors too. Below is the snippet.

        var deferred = protractor.promise.defer();
        var options = {
            method: "GET",
            hostname: hostname,
            port: 8080,
            path: '/v1/fis/'+fiId+'/businessCustomers/'+userAuthId+'/approvals',
            headers: {
                'authorization': 'testclient',
                'content-type': 'application/json',
                'accept': 'application/json',
            }
        };
    
        var req = http.request(options, function (response) {
            browser.sleep(1000);
            console.log('headers are:', options);
            console.log('hostname is: ', hostname);
            browser.sleep(1000);
            console.log('STATUS for approval API : ' + res.statusCode);
            var chunks = [];

            response.on("data", function (chunk) {
                console.log('in chunk block::');
                chunks.push(chunk);
            });

            response.on("end", function () {
                var body = Buffer.concat(chunks);
                var finaljson = JSON.parse(body.toString());
                console.log('finaljson is:****', finaljson);
                successCallBack(finaljson.SuccessResponse);
            });
        });

        req.end();
        return deferred.promise;

    };```


Any insights will be helpful. TIA!